A primary source is a source from the relevant time, done by someone who actually witnessed the event, not a source made later.
A primary source for a reasons of an event would be for example an opinion of a person from the time, so for example an opinion of a soldier of why they choose to participate in the war: best expressed in his own words, such as in a letter.
The poster on the wall served for Coreen as a "<span>retrieval cue".
Retrieval cues are pushes or inducements (stimuli), that assistance you recover a specific memory. When we are in the formation process of new memories we take in various situations to process the information and then any of those stimulus can help us recover the memory.
</span>
they both have democracy government style because they let the people make governmental decisions. Both presidents have similar government system and branches of government